Branches decumbent-ascending, sparsely ramified, 0.1-0.25 m long, slender, commonly dark reddish, sparsely tomentose. Leaflets filiform, (3-)6-13 mm long, 0.2-0.4 mm thick, often slightly incurved, weak, flexible, acute-acuminate, with sparse, spreading, long hairs from ± distinct hair base tubercles. Heads subglobose, with 5-15 flowers. Bracts mainly trifoliolate (central ones unifoliolate), on a basal stalk up to 1.5 mm long; leaflets slender, linear-filiform, (6.5-)9-14 mm long, similar to leaflets of vegetative leaves, green or frequently purplish. Pedicel less than 1 mm long, sericeous. Bracteoles similar to each of the bract leaflets, (5.8-)8.5-12.5 mm long. Calyx tube woolly-sericeous; lobes linear-filiform, (5.5-)7-9.5 (-10.5) mm long, narrow, flexible, acuminate, purplish violet, with long, spreading hairs from ± distinct hair base tubercles. Petals pale or light yellow (standard sometimes purplish). Standard blade obovate, (5.2-)6.5-8(-12.5) x (5-)6.5-8.5 mm, without or with very short cusp, tomentose on the back, glabrous on the front. Wing blades narrowly elliptic, (3.3-)4.2-5 x (1.2-)2-2.5 mm. Keel blades lunate, (4.6-)5.5-6.5 x (2.7-)3.5-4 mm, sparsely sericeous on most parts; upper margin very slightly S-curved. Wing and keel claws 2.7-4 mm long, basally adnate to the staminal sheath. Pistil: ovary tomentose; style base pubescent on upper side of basal half. Pod narrowly ovate, ±6.5-8 x 2.5-3 mm, smooth, tomentose-woolly on most parts (glabrous on the base).
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Sprawling shrublet with branches to 25 cm. Leaves 3-foliolate, leaflets terete, often slightly incurved, weak, sparsely long hairy. Flowers in terminal heads, pale yellow, standard sometimes purplish, wings glabrous, keel sparsely hairy, calyx woolly hairy, lobes linear to terete, flexible, purplish violet with long hairs from distinct tubercles.